package cn.dglydrpy.study.smartmvc.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import cn.dglydrpy.study.smartmvc.entity.User;

/**
 * 登录拦截器
 */
public class AccessFilter implements Filter {
	@Override
	public void doFilter(ServletRequest request,ServletResponse response,FilterChain chain)
			throws IOException, ServletException {
		HttpServletRequest req=(HttpServletRequest)request;
		HttpServletResponse res=(HttpServletResponse)response;
		HttpSession session = req.getSession();
		User loginUser = (User)session.getAttribute("loginUser");
		if(loginUser==null) {
			String login=req.getContextPath()+"/user/start-login.do";
			res.sendRedirect(login);
			return;
		}
		chain.doFilter(req, res); 
	}
	
	@Override
	public void init(FilterConfig arg0) throws ServletException {}

	@Override
	public void destroy() {}
}
